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- W2008021875 abstract "Several studies have reported that the chronic administration of opioids induces changes in the biosynthesis of endogenous opioid peptides or their precursors in specific brain regions of the adult central nervous system. However, little is known about the catabolic regulation of opioid peptides and its contribution to neuroadaptative changes underlying drug addiction. In the present study, we have analyzed the activity of two enkephalin-degrading enzymes (puromycin-sensitive aminopeptidase or PSA and aminopeptidase N or APN) and two functionally different, soluble aminopeptidases (aminopeptidase B and aspartyl-aminopeptidase) in postmortem samples of prefrontal cortex and caudate nucleus of eight human heroin addict brains and eight matched-controls. Enzyme activities were fluorimetrically measured using β-naphthylamide derivatives. An increase in the activity of soluble PSA in the prefrontal cortex of heroin abusers was observed (heroin addict group: 51,452 ± 3892 UAP/mg protein versus control group: 42,003 ± 2597 UAP/mg protein; P < 0.05), while the activity of the other peptidases in both brain regions remained unaltered. This result agrees with previous findings in morphine-tolerant rats, and indicates that soluble PSA may be involved in neurobiological processes which underlie heroin addiction." @default.
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- W2008021875 date "2005-02-01" @default.
- W2008021875 modified "2023-09-25" @default.
- W2008021875 title "Aminopeptidase activity in the postmortem brain of human heroin addicts" @default.
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- W2008021875 doi "https://doi.org/10.1016/j.neuint.2004.10.001" @default.
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